(19)
(11) EP 0 216 587 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.03.1989 Bulletin 1989/09

(43) Date of publication A2:
01.04.1987 Bulletin 1987/14

(21) Application number: 86307065.2

(22) Date of filing: 12.09.1986
(51) International Patent Classification (IPC)4G01B 11/10, G01B 11/02
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI NL SE

(30) Priority: 13.09.1985 GB 8522750

(71) Applicant: TESA METROLOGY LIMITED
Telford Shropshire TF7 4QN (GB)

(72) Inventor:
  • Aldred, Philip James Eric
    Shrewsbury Shropshire (GB)

(74) Representative: Bayliss, Geoffrey Cyril et al
BOULT, WADE & TENNANT 27 Furnival Street
London EC4A 1PQ
London EC4A 1PQ (GB)


(56) References cited: : 
   
       


    (54) Improvements to optical measurement apparatus


    (57) The disclosure relates to optical measurement apparatus for determining a plurality of dimensions of an object at linearly spaced locations on the object, comprising a measurement station for measurement of a linear dimension of the object, means to move the object through the measurement station to present the locations to be measured one by one, a light source (3) on one side of the measurement station to direct a beam of light at the location of the object (1) in the measuring station transversely to the required line of measurement and to the path of movement of the object through the station, elongate photo-electric array means (14,15) disposed on the opposite side of the measurement station to the light source and lens means (6, 7) to focus an image of the part of the object to be measured on the photo-electric array means to form an image thereon of said part of the object. An elongate measurement graticule (39) is provided on which a scale is delineated and means (38) are provided for directing collimated light through the graticule and thence into the lens system to be focused on to the photo-electric array means whether or not an object is present in the apparatus for calibration of the array means prior to or during a cycle of measurement of an object.










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